Consider the following case study and draw level 0 DFD : A University of Lahore offers different courses to students. Each course lasts 17 weeks and is based on a monthly study module and progress test. The University Registrar deals with the enquiries and applications of students. Students having required qualification will apply and asked to register by completing and submitting an application form. After approval by the Academic Director, the application form is returned to the Registrar who creates a student file. The Accounts department receive the application form and using information from the student file, creates an invoice that is sent to the student. Payments made are saved in the invoice file. The first batch of student material and tests is issued from the library only to students who have paid their fees. Academic staff mark progress tests and the results, together with comments, are sent out with next weeks study block. The library will only issue study material/progress tests when a student has returned test answers from the previous week.